■ noun
1》 a marine or freshwater reptile with a bony or leathery shell and flippers or webbed toes. [Many species in the order Chelonia.]
↘the flesh of a sea ~, used chiefly for soup.
2》 a directional cursor in a computer graphics system which can be instructed to move around a screen.
Phrases
turn ~ (chiefly of a boat) turn upside down.
Origin
C16: appar. an alt. of Fr. tortue (see tortoise ).